John doyle



(No Model.)

J. DOYLE.

ELBGTRIG MOTOR. No. 391,590. Patented Oct. 23, 1888.

PATENT JOHN DOYLE, OF HOBOKEN, NElV JERSEY, ASSIGNOR TO HIMSELF, AND O. OOLES DUSENBURY, OF LAKE MAHOPAO, NEW YORK.

ELECTRlC MOTOR.

SPECIFICATION forming part of Letters Patent No. 391,590, dated October 23, 1888. Application filed September 3, 1887. ScrialNo. 218,709. (X0 model.)

To aZZ whom it may concern.-

Be it known that 1, JOHN DOYLE, of Hoboken, in the county of Hudson and State ofNew Jersey, have invented an Improvement in Electric Motors, of which the following is a specification.

My present invention is an improvement upon that for which Letters Patent No. 343, 444: were granted to me.

I make use of a field-magnet having iron pole-faces of uniform thickness, curved as arcs of circles, so that the magnetism developed may be close to the path of the revolving armaturecores, and hence act in the most efiicient manner, and the cores of the armaturehelices are curved and placed in alternate opposite directions upon the armature-shaft so as to travel close to the curved poles, and the commutatonsprings are provided with removable contact-blocks,so that the wear does not come upon the springs, and the machine can be run in either direction without any risk ofinjury to the springs, and the contact-blocks can be removed and replaced instantly when worn out, and they will wear much longer than the ordinary springs or brushes.

In the drawings, Figure 1 is a section of the magnets and an elevation of the shaft and commutators. Fig. 2 is a cross-section at the line as :0, and Fig. 3 is an elevation of the cornmutator and section of the frame at the line 3 y and a diagram of the circuit-connections.

The field-magnets are made with cores A, helices B, and pole-pieces C. The pole-pieces O are of uniform thickness and width, and are of soft iron bent with the parallel portions 3 and the intermediate curved portions, 4, the said portions 4 being arcs of circles described from the axis of the revolving armature. The portions 2 are permanently fastened upon the ends of the cores A, and the portions 3 form feet for supporting the field-magnets upon the base 1), of wood or other non-magnetic material. It is preferable to tie the parts together by the plates E F, of brass or similar metal,and to fill in the spaces behind the curved polepieces 0 with wood or other non-magnetic material, as at H. v

The object of making the pole-pieces of uni form width and thickness is to insure the most efficient development of induced magnetism. The pole-pieces are magnetired north and south by induction from the cores, and said pole-pieces are of nearly uniform magnetism throughout, instead of having one or more centers of magnetism that are distant from the curved pole-faces, as in field-magnets that have poles of square blocks recessed on the inner faces. The wooden blocks E, that fit the pole-pieces, serve to stiffen the parts and prevent vibration.

The armature is made with a shaft, K, sup ported in suitable bearings, I, and upon this shaft are one or two heads, L H, from which the cores 0 O and P 1 respectively project, and these cores extend toward each other, but the cores 0 are opposite to the spaces between the cores P, and each core is curved and nearly a quarter of a hollow cylinder or ring. If only one head, L or M, is used, there may be two, three, or more cores projecting from it, the cores being curved,as aforcsaid,or the number of cores on each head may be more than shown.

The helices O P surround the espcctive cores, and the wires are bent so as to fit closely to the cores. The cores extend in between the pole-pieces O and travel as close to the same as possible without risk of eonto ct. The helices around the cores are outside or beyond the edges of the curved pole-pieces.

The connections from the armature-hclie to the insulated commutatonplates s a any desired character, as illustrated in and the helices of the field-magnets wi the main-line circuit, the meta lic connectio being from one bending-post to the end n helix and from the end of the other nel one commutator-brush, thence through armature-helices to the other brush and circuit bending-post.

The commutatorsprings are fastened upon the respective insulated blocks spring has a segmental contact b och, i of 1 metal, such copper, with a QUIMGQ s in contact with the commutator-p ates, and a tang, S, at the back passing through a mortise in the spring, so that the spring wil press the contactblocl; upon the commutator -plates, and the surfac s will bear uniformly and wear true, and the contact-blocks are more durable ZOO than the springs heretofore used, and there is no risk of injury to the parts, whether the machine is run in one direction or the other, Whereas with springs alone the metal is liable to wear through and the ends to catch in the commutator-plates.

Where two field-magnets are used, the cores of the second magnet are attached to the parallel end portions, 3 3, of the pole-pieces in place of the base-plate F.

If two field-magnets and their pole-pieces, constructed as aforesaid, are used, there may be only one head, L or M, between such magnets, with the cores 0 P, curved as described, projecting from the opposite faces of such head and passing in between the pole-pieces, or the machine as represented may be duplicated, there being one armature-shaft passing through between the pole-pieces 0f the two machines, and carrying all the heads, cores, and armature-helices.

I claim as my invention- 1. The combination, with the field-magnets and the curved pole-pieces, of an armatureshaft, heads at the respective ends of the same, curved cores carried by and projecting from said heads toward each other, the cores upon one head being opposite to the spaces between the cores of the other head, the ends or polesv of the said cores revolving within and adjacent to the curved polepieces, and the helices around the curved cores and outside the edges of the curved polepieces, substantially as set forth.

2. The combination, with the revolving armature and the commutator-plates, of springs connected at one end to insulated blocks and having their other ends curved to correspond to the curve of the commutator-plates, the movable segmental contact pieces between the curved ends ofthesprings and the commutatorplates, the said contact-pieces having curved inner surfaces corresponding to and in contact with the commutator-plates, and a tang upon the back of each of the contact-pieces and passing through a mortise in the spring, whereby the segmental contactpieces can accommodate themselves to the curvature of the armature plates and take an even bearing thereon, substantially as specified.

Signed by me this 1st day of September,

JOHN DOYLE. Witnesses:

WILLIAM G. Morr, HAROLD SERRELL. 

